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'J. T. 8u W. I-I. I-I. GRISGOM.

TUBE BXPANDBR. No. 257,319. PatentedMay 2,1882.

UNITED STATES ATENT rrree.

JOSEPH T. GRISCOM AND VILLIAM H. H. GRISGOM, OF NASHVILLE, TENN.

TU BE-EXPANDER.

SPECIFICATION forming part of Letters Patent No. 257,319, dated May 2, 1882. Application filed March 7, 1882. (No model.)

To all whom it may concern Be it known that we, JOSEPH T. GRISCOM and WILLIAM H. H. GRIscoM, of Nashville, in the county of Davidson and State of Tennessee, have invented a new and Improved Roller Tube-Expander, of which the following is a full, clear, aud exact description.

The object of our invention is to provide a cheap and efficient device for expanding the ends of boiler-tubesl for securing them in the head-plates ofthe boiler; and the invention consists in the combination,with the headed rollers, the recessed plate, and the radially slotted center plate, ot' the radially-slotted plate whose slots are contracted at theirinner ends, and in the headed rollers and the centrally-perforated plates, in combination with the annular recessed plate, the said plates being held together by screw-bolts, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming` part of this specification, in which similar letters ot' reference indicate corresponding parts in all the figures.

Figure l is a rear elevation of our invention. Fig. 2 is a front elevation of the same. Fig. 3 is a sectional elevation taken on the line 00 x of Fig. l, and Fig. 4 is a similar view 1U size, as shown at b, to i'orm the heads a; and l taken on the line y y of Fig. 3.

A A represent the rollers, which are reduced B, C, and D represent the plates in which the rollers are held, the plates being adapted to be secured together by the screw bolts d d, as clearlyindicated in the drawings. The plate D is formed with the central opening,f, andis recessed upon its rear-or inner face, as shown at g g, to receive the heads a ofthe rollers A, as shown in Fig. 3. The plate C is cut away in the center to form the opening' c, corresponding in size to the openingf in the plate D, and is formed with the radial slots h, which are of such width as to just receive the reduced portion b ofthe rollers, and the plate B is cut away in the center to form the opening i, corresponding in size to the central openings,c and f, of the plates C and D, and is formed with the radial slots j, of a size to receive the larger portions of the rollers, and having their inner ends contracted to prevent the rollers from coming out, as clearly indicated in Fig.

l. The parts are put together as follows: The plates C and D are first brought together and the rollers inserted therein, when the plate B is pnt over the outer ends of the rollers, pushed 5 5 against the plate C and the whole clamped together by the screws d. By this construe tion ofthe plates. it will be seen that a central passage is formed entirely through the device, and that the rollers will be loosely held in the 6o plates and will be adapted to have slight radial movement in the plates, so that they may be easily inserted in the end of the tube and forced out for expanding the tube.

ln use, the rollers A A having been thus inserted in the end of the tube, a mandrel, which by preference is made slightly tapering, as shown in dotted lines in Fig,. 3, is passed through the central opening of the device as far as it will go.

The mandrel is operated by a hand-lever for forcing and working the device around in the end of the tube for expanding and enlarging the tube in the ordinary way of securing it in the head-plate of the boiler.

It will be understood that we do not confine our invention to the use of three separate plates, as the plates D and C might be made in one part, it' desired, an d other changes might be made and not depart from the spirit ot' our 8o invention.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. The headed rollers A and the centrally- 85 perforated and radially-slotted plates B and C, in combination with the annular .recessed plate D, the plates being secured together by the screw-bolts d, substantially as described.

2. The combination, with the headed rollers 9o A, the recessed plate D, and the radial slotted plate C, of the plate B, provided with the radial slotsj, having their inner ends contracted, substantially as and for the purpose set forth.

JOSEPH T. GRISCOM. WlLLIAM H. H. GRISGOM. Witnesses:

W. H. BLACKMAN,

J. L. MORGAN.- 

